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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '483ada267d87c6a6bd0c450bd25405342098988b0dfac3cae8529e63fb7c3f25' 
  AND token = 'wOwM8ZaQfVx0l5r5kaCXDO811qIj843bpMX1Gd+xvu8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00037

JSON explain

{
  "query_block": {
    "select_id": 1,
    "message": "no matching row in const table"
  }
}